Revert "Use native async/await support in pub."

sdk/lib/_internal/pub_generated/test/dart2js/does_not_support_invalid_environment_type_test.dart

Index: sdk/lib/_internal/pub_generated/test/dart2js/does_not_support_invalid_environment_type_test.dart
diff --git a/sdk/lib/_internal/pub/test/dart2js/does_not_support_invalid_environment_type_test.dart b/sdk/lib/_internal/pub_generated/test/dart2js/does_not_support_invalid_environment_type_test.dart
similarity index 56%
copy from sdk/lib/_internal/pub/test/dart2js/does_not_support_invalid_environment_type_test.dart
copy to sdk/lib/_internal/pub_generated/test/dart2js/does_not_support_invalid_environment_type_test.dart
index 27a62da8d661d9a8dd2651d90644a07f06b0a0c6..7cb55fb7b69dc9fcd299ce5916b5f503857c73de 100644
--- a/sdk/lib/_internal/pub/test/dart2js/does_not_support_invalid_environment_type_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/dart2js/does_not_support_invalid_environment_type_test.dart
@@ -9,26 +9,23 @@ import '../serve/utils.dart';
 main() {
   initConfig();
   integration("doesn't support invalid environment type", () {
-    d.dir(appPath, [
-      d.pubspec({
+    d.dir(appPath, [d.pubspec({
         "name": "myapp",
         "transformers": [{
-          "\$dart2js": {
-            "environment": "foo",
-          }
-        }]
-      }),
-      d.dir("web", [d.file("main.dart", "void main() {}")])
-    ]).create();
+            "\$dart2js": {
+              "environment": "foo",
+            }
+          }]
+      }), d.dir("web", [d.file("main.dart", "void main() {}")])]).create();
 
     var server = pubServe();
     // Make a request first to trigger compilation.
     requestShould404("main.dart.js");
-    server.stderr.expect(emitsLines(
-        'Build error:\n'
-        'Transform Dart2JS on myapp|web/main.dart threw error: '
-            'Invalid value for \$dart2js.environment: "foo" '
-            '(expected map from strings to strings).'));
+    server.stderr.expect(
+        emitsLines(
+            'Build error:\n' 'Transform Dart2JS on myapp|web/main.dart threw error: '
+                'Invalid value for \$dart2js.environment: "foo" '
+                '(expected map from strings to strings).'));
     endPubServe();
   });
 }